Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2001SABLE LS, 4D SEDAN, 3.0 U, AX4SREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - AUTOMATIC
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4S
HVAC System - Automatic
2001 Mercury Sable LS, 4D Sedan, 3.0 U, AX4SSECTION HVAC System - Automatic
- Specifications
- Description
- Operation
- Trouble Shooting
- Symptom Tests
- Notes
- Test A: No Communication With RCC Module
- Test B: EATC System Inoperative, Intermittent Or Improper Operation
- Test C: Improper/Erratic Airflow From Outlets
- Test D: Insufficient, Erratic Or No Heat
- Test E: A/C Does Not Operate Or Does Not Operate Properly
- Test F: A/C Is Always On
- Test G: Blower Motor Inoperative
- Test H: Blower Motor Operates Continuously At High Speed
- Test I: Blower Motor Inoperative In Some Speeds
- Test J: Temperature Set Point Does Not Repeat After Turning Ignition Off
- Test K: Temperature Display Will Not Shift Between FAHRENHEIT & CELSIUS
- Self-Diagnostics
- Diagnostic Tests
- DTC B1249: Blend Door Failure
- DTC 1251: In-Car Temperature Sensor Open
- DTC 1253: In-Car Temperature Sensor Short
- DTC 1255: Ambient Air Temperature Sensor Open
- DTC 1257: Ambient Temperature Sensor Short
- DTC 1260: SUNLOAD Sensor Circuit Open
- DTC 1261: SUNLOAD Sensor Shorted
- DTC U2005: Communication Error Between RCC Module & ICP
- System Tests
- Removal & Installation
- Torque Specifications
- Vacuum Hose Diagram(S)
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.